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| author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2021-08-11 00:07:41 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-08-18 05:28:39 +0300 |
| commit | 5f492a7aa13b4ebf8ca85e818585394053065240 (patch) | |
| tree | 3951bb134fb39260a45ea9e75e167b232dabf02e | |
| parent | 0f99792c01d1d6d35b86e850e9ccadd98d6f3e0c (diff) | |
| download | linux-5f492a7aa13b4ebf8ca85e818585394053065240.tar.xz | |
scsi: smartpqi: Replace one-element array with flexible-array member
There is a regular need in the kernel to provide a way to declare having a
dynamically sized set of trailing elements in a structure. Kernel code
should always use "flexible array members"[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].
Refactor the code a bit according to the use of a flexible-array member in
struct pqi_event_config instead of a one-element array, and use the
struct_size() helper.
This helps with the ongoing efforts to globally enable -Warray-bounds and
get us closer to being able to tighten the FORTIFY_SOURCE routines on
memcpy().
This issue was found with the help of Coccinelle and audited and fixed,
manually.
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays
Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109
Link: https://lore.kernel.org/r/20210810210741.GA58765@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/smartpqi/smartpqi.h | 2 | ||||
| -rw-r--r-- | drivers/scsi/smartpqi/smartpqi_init.c | 3 |
2 files changed, 2 insertions, 3 deletions
diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h index f340afc011b5..70eca203d72f 100644 --- a/drivers/scsi/smartpqi/smartpqi.h +++ b/drivers/scsi/smartpqi/smartpqi.h @@ -415,7 +415,7 @@ struct pqi_event_config { u8 reserved[2]; u8 num_event_descriptors; u8 reserved1; - struct pqi_event_descriptor descriptors[1]; + struct pqi_event_descriptor descriptors[]; }; #define PQI_MAX_EVENT_DESCRIPTORS 255 diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c index fb31fb6b0979..ecb2af3f43ca 100644 --- a/drivers/scsi/smartpqi/smartpqi_init.c +++ b/drivers/scsi/smartpqi/smartpqi_init.c @@ -4741,8 +4741,7 @@ static int pqi_create_queues(struct pqi_ctrl_info *ctrl_info) } #define PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH \ - (offsetof(struct pqi_event_config, descriptors) + \ - (PQI_MAX_EVENT_DESCRIPTORS * sizeof(struct pqi_event_descriptor))) + struct_size((struct pqi_event_config *)0, descriptors, PQI_MAX_EVENT_DESCRIPTORS) static int pqi_configure_events(struct pqi_ctrl_info *ctrl_info, bool enable_events) |